It sounds like you were feeling sorry for this man and befriended him to "help" him. He took your kindness as a real interest in him and then, when he tried to get closer you pushed back. He is very hurt and expresses the hurt as being mad with you. If that is the case and you have no interest in thjs man I wonder why you took up with him in the first place? My advice is not to get involved with someone out of pity. Or, maybe you didn't for that reason? Maybe you liked him a little? Even I am confused. Poor guy had his feelings hurt. I would suggest sending him a reply email and tell him that you are sorry but you have a full life with many friends and do not have the proper amount of time to invest in another friendship. This will put an end to things on your side rather than just walking away without a word. It's just a suggestion of course. I never liked it when a man just cut me off and left me hanging, it took me much longer to get past the hurt when that happened.